body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.container {
    max-width: 800px;
}

.card {
    border: none;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.task-item {
    border: none;
    border-radius: 10px;
    margin-bottom: 10px;
    transition: all 0.3s ease;
    border-left: 4px solid #007bff;
}

.task-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.task-completed {
    opacity: 0.7;
    border-left-color: #28a745;
}

.task-completed .task-title {
    text-decoration: line-through;
    color: #6c757d;
}

.btn-action {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.task-item:hover .btn-action {
    opacity: 1;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.task-item {
    animation: fadeIn 0.5s ease;
}